Investigation of involved LN stations reveals that patients with an undefined subtype demonstrate oligocentricity. (A) The relationship between the number of enlarged LN stations plotted against the number of minor diagnostic criteria. Patients with CD-undefined can be visualized separately from both UCD and iMCD. (B) Most of CD-undefined cases had ≤4 enlarged LNs in the same general region. These patients demonstrate oligocentric lymphadenopathy and henceforth will be referred to as OligoCD. (C) Cases that were panel-confirmed iMCD were typically diagnosed iMCD by their treating physician (n = 109; 91.6%), and cases that were panel-confirmed UCD were typically diagnosed UCD by their treating physician (n = 41; 89.1%). Patients with CD-undefined were diagnosed as UCD in 64.3% of cases (n = 9), and iMCD in the remaining 35.7% (n = 5).